Open channel sewage flowmeter | Ultrasonic open channel flowmeter measurement principle

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1. What flow meters are commonly used for measuring sewage discharge? There are only three types of liquid flow meters commonly used for sewage discharge: electromagnetic flow meters, ultrasonic flow meters, and ultrasonic open channel flow meters. Electromagnetic flow meters have the highest accuracy, most stable performance, and are maintenance free, so sewage discharge enthusiasts usually use electromagnetic flow meters. Although ultrasonic flow meters are easy to install, their measurement effect is poor and the accuracy of open channels is too poor. 2. Measurement principle of ultrasonic open channel flow meters is to set up standardized weirs in the open channel and measure the water level at designated positions, so that the flow rate through the weirs is in a single value relationship with the water level; Measure the water level, and convert the ultrasonic open channel flowmeter into a flow value based on the corresponding flow formula or empirical formula. The larger the flow rate in the ultrasonic open channel flowmeter channel, the higher the liquid level in the weir; The smaller the flow rate, the lower the liquid level. In general channels, there is no definite correspondence between liquid level and flow rate. Because of the same water depth, the flow rate is also related to the cross-sectional area, slope, and roughness of the channel. 2. Install a channel weir in the channel. The correspondence between upstream water level and channel flow mainly depends on the geometric dimensions of the weir due to the narrowing of the groove or trough being smaller than the cross-sectional area of the channel. The same weir is placed on different channels, and the same liquid level corresponds to the same flow rate. The weir converts flow into liquid level. There are generally two types of level gauges used in open channel flow meters, namely ultrasonic level gauges and static level gauges. Ultrasonic open channel flow meters are instruments used to measure the flow rate of liquid in self flowing open channels with incomplete pipelines. The application fields of ultrasonic open channel flowmeter include urban water supply channels, power plant cooling water drainage channels, sewage treatment inlet and outlet channels, industrial and mining chemical liquids, wastewater discharge, and water conservancy agricultural irrigation channels. There are various shapes of open channel flow meters besides circular ones, such as U-shaped, trapezoidal, rectangular, etc.

3. Application and characteristics of ultrasonic open channel flowmeter

Ultrasonic open channel flowmeter is mainly used for flow measurement of open channel culverts. It is widely used in fields such as water conservancy irrigation areas, sewage treatment, industrial and mining enterprise wastewater discharge, water conservancy engineering, and agricultural irrigation. It has the characteristics of accurate measurement, adaptability to complex working conditions, diverse communication methods, flexible power supply, and convenient operation.

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